Hi, we moved into our new house in February of this year - this has a large (to my eyes) pond that is approx 4 * 7 m oval shape - between 0.5 & 1m deep - with shallower shelves. This has a pump that drives water to a water feature, followed by a much smaller pond ("the wildlife pond") & then back into the main pond. The pump is driven from a mains extension - so is not always on.
The fish woke up in spring & the water got murkier & murkier - so we tried adding plants & running the pump for a while. After running the pump, we decided that the small middle pond could not take the full flow of water without washing all the plants away, so I split the flow - such that some of it goes directly back into the main pond & some of it goes to the top.
We were running the pump occasionally - certainly not daily & certainly not all the time.
The fish looked healthy & more & more numerous but we only ever saw them for a couple of minutes a day when we feed them - so I added a filter (Swell pressure filter).
The water seemed to be clearing albeit quite slowly - but I expected that as I think the pump is undersized for the pond size - but if I go for a complete water change every 90 minutes as recommended elsewhere, then we would have quite a torrent flowing - and we don't want that.
We have 1 ghost koi, 30 - 40 goldfish of medium size (15-25 cm) and quite a lot of much smaller fish (this year's young?)
I turned the pump off overnight last night & when I came down this morning, most of the fish were at the surface - apparently gasping. From what I can glean from the internet - this means they are short of oxygen. We cleaned the filter, added some hose water via a fine spray, turned the pump back on & it rained - so I'm quite happy they are ok again.
It seems as if the filter has upset whatever balance we had in the pond & removed some oxygenation capacity from it - such that we will now need to run the pump & filter continuously. Is this to be expected with a new filter? Will it improve again as the filter matures? Will I ever be able to turn off the pump again?
We have an obvious issue with overstocking - are there groups out there who are looking for replacement fish?
Many thanks for any input.
The fish woke up in spring & the water got murkier & murkier - so we tried adding plants & running the pump for a while. After running the pump, we decided that the small middle pond could not take the full flow of water without washing all the plants away, so I split the flow - such that some of it goes directly back into the main pond & some of it goes to the top.
We were running the pump occasionally - certainly not daily & certainly not all the time.
The fish looked healthy & more & more numerous but we only ever saw them for a couple of minutes a day when we feed them - so I added a filter (Swell pressure filter).
The water seemed to be clearing albeit quite slowly - but I expected that as I think the pump is undersized for the pond size - but if I go for a complete water change every 90 minutes as recommended elsewhere, then we would have quite a torrent flowing - and we don't want that.
We have 1 ghost koi, 30 - 40 goldfish of medium size (15-25 cm) and quite a lot of much smaller fish (this year's young?)
I turned the pump off overnight last night & when I came down this morning, most of the fish were at the surface - apparently gasping. From what I can glean from the internet - this means they are short of oxygen. We cleaned the filter, added some hose water via a fine spray, turned the pump back on & it rained - so I'm quite happy they are ok again.
It seems as if the filter has upset whatever balance we had in the pond & removed some oxygenation capacity from it - such that we will now need to run the pump & filter continuously. Is this to be expected with a new filter? Will it improve again as the filter matures? Will I ever be able to turn off the pump again?
We have an obvious issue with overstocking - are there groups out there who are looking for replacement fish?
Many thanks for any input.